Buying a house with three things in the foundation. They’re open. Do I need to do anything? : HomeImprovement

That’s for airflow across the foundation. It help excess moisture from under the house to be disappated. I would as a precautionary measure get on the inside if the foundation and install some 1/4 inch screen just to keep critters out from under the house. They can wreak a ton of havoc on your insulation if the set up residence.

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